Wood, who died Tuesday at 83, conceived of synchronizing music to fireworks, created the annual Riverfest pyrotechnics show, ...

K45LA brings you the first broadcast!” featuring an FM radio starting at $89.95. For a mere $37.50, you could buy an FM adapter for your AM radio.

FM radio also uses electromagnetic waves to carry audio, though the technique of “frequency modulation” did not become dominant until the 1970s.